diff --git a/templating/formats.rst b/templating/formats.rst
index aab13d049f4..ad00ddab428 100644
--- a/templating/formats.rst
+++ b/templating/formats.rst
@@ -51,7 +51,7 @@ be configured so that ``/about-us`` sets the request format to ``html`` while
 special ``_format`` placeholder in your route definition::
 
     /**
-     * @Route("/{slug}.{_format}", defaults={"_format"="html"})
+     * @Route("/{slug}.{_format}", defaults={"_format"="html"}, requirements={"_format"="html|xml"}))
      */
     public function showAction(Request $request, $slug)
     {